Can red algea live in fresh water?

Causes for Red Algae in the Aquarium The most likely reason for red algae is introduction of contaminated plants or a bag of fish from a store tank with red algae. This can come in as some small filaments floating in the water, as water born spores or perhaps in the digestive tract of fishes. read more

Species of red algae. Over 7,000 species are currently described for the red algae, but the taxonomy is in constant flux with new species described each year. The vast majority of these are marine with about 200 that live only in fresh water. read more

They also grow on animals like alligators, crustaceans, worms, rotifers, snails, turtles, aquatic ferns and freshwater sponges. They can also live on and inside water plants, including other algae. When there is sufficient available moisture, they grow and flourish. Algae have the ability to convert sunlight into energy. read more